Just finished period... Weird symptoms?

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Hi. I just finished my period on the 22nd. I am on the pill, and I started my pack early because my boyfriend surprised me and I wanted to finish my period sooner. However, my nipples have been hurting (they are also pretty erect) I’ve been getting slight cramping and I think I have a UTI. Would it be possible for me to be pregnant, or is this just the birth control? My period was very heavy when I had it.

I mentioned the UTI because when I found out I was pregnant last time I had a UTI.. But I think the UTI may just be from having sex on my period, I’m not sure.